JP2013004598A - Cooling apparatus for transformer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cooling apparatus for a transformer with a simple structure, which can cool a transformer efficiently.SOLUTION: A cooling apparatus for a transformer comprises: a case 1 housing a transformer 2; a first parting plate 6, in the case, for separating area around the transformer into back and front parts so as to form a first ventilation flue 7 in a back side of the transformer; evacuation ceiling fans 8a and 8b disposed on an upper surface of the case facing the first ventilation flue; cooling air intake ports 4a and 4b formed in a front face of the case and positioned to face a base portion 2a of the transformer; and a second parting plate 10 for separating the cooling air intake ports into upper and lower parts, at the same time, separating area around the base portion of transformer into upper and lower parts. One cooling air ventilation flue runs from the cooling air intake ports through a second ventilation flue under the second parting plate, winding parts of the transformer, and the first ventilation flue to the evacuation ceiling fans. Another cooling air ventilation flue runs from the cooling air intake ports through space between the winding parts of the transformer to the first ventilation flue.

Description

  The present invention relates to a transformer cooling device for cooling a transformer disposed in a casing.

  In a semiconductor power conversion device, a part that cools a heat generating device such as a semiconductor unit that constitutes a main circuit, a main circuit transformer, and a control unit that is constituted by an electrical device of a control printed board that is relatively heat-sensitive, Each of them is stored separately in three panels (casings). In particular, a panel (housing) that houses a main circuit transformer that generates a large amount of heat employs a forced ventilation system in which an air inlet is provided at least in front and exhausted by a ceiling fan (see, for example, Patent Document 1). In the conventional example described in Patent Document 1, a transformer panel in which a housing is partitioned into an upper space and a lower space is disclosed. In this transformer panel, a transformer-side insulating plate that serves as a housing internal space partition member that prevents the cooling air generated by the cooling fan from flowing between the upper space and the lower space, a housing-side insulating support member, An intake air rectifying plate is provided. Further, in this transformer panel, the cooling air generated in the housing by the rotation of the cooling fan is guided into the cylindrical insulator surrounding the outer periphery of the transformer coil, and the transformer coil is cooled. Is disclosed.

  As another cooling method, a wind guide tube in which the entire transformer coil is loosely fitted inside is erected from the partition plate at the lower part of the box, and is sucked into the interior from the lower intake port of the partition plate. Forced draft type transformer that raises the cooling air between the inside of the air guide tube and the coil and cools the primary side coil and the secondary side coil under substantially the same cooling conditions to reduce the difference in temperature rise. An instrument box has been proposed (see, for example, Patent Document 2).

JP 2009-76825 A JP 2000-2322022 A

Here, in the conventional examples described in Patent Documents 1 and 2, air is taken in only from the front side of the housing that houses the transformer, and cooling air taken into the housing is passed around the transformer. It is a forced ventilation system that exhausts to the outside with a cooling fan placed through.
However, in the conventional examples described in Patent Documents 1 and 2, in order to guide the cooling air taken from the front of the casing around the transformer, a blower fan and a coil of the transformer are used. A wind guide cylinder that loosely fits a cylindrical insulator and a coil that surrounds the outer peripheral portion, and a wind guide mechanism that guides cooling air to the lower portion of the cylindrical insulating section and the wind guide cylinder are required. Therefore, there is an unsolved problem that the configuration is complicated and the casing is enlarged. Further, in the conventional examples described in the cited references 1 and 2, the cooling air passage is limited only to the periphery of the transformer, so that the air resistance increases, the air flow of the cooling fan decreases, and the cooling efficiency decreases. There are unresolved issues. Furthermore, in the conventional example described in the cited document 1, since the cylindrical insulator is provided around the secondary coil, it is necessary to change the design of the transformer itself, which greatly increases the cost of the dry transformer. However, there is an unsolved problem that it cannot be said to be suitable.
Accordingly, the present invention has been made paying attention to the unsolved problems of the above-described conventional example, and an object thereof is to provide a transformer cooling device capable of efficiently cooling the transformer with a simple configuration. It is said.

  In order to achieve the above object, a transformer cooling device according to a first embodiment includes a housing that houses a transformer, and a back side of the transformer that divides the periphery of the transformer in the front and back in the housing. And a first partition plate forming a first ventilation path. And in the said cooling device, it forms in the position facing the base part of the said transformer in the front of the said housing | casing, the exhaust ceiling fan arrange | positioned on the upper surface of the said housing | casing facing the said 1st ventilation path. The cooling air intake port is formed. Further, the cooling device includes a second part that divides the cooling air intake port into upper and lower parts, partitions the periphery thereof vertically on the base side of the transformer, and has an opening facing at least the winding part of the transformer. And a partition plate. Then, cooling from the cooling air inlet through the second ventilation path below the second partition plate, through the winding portion of the transformer, and further through the first ventilation path to the exhaust ceiling fan. An air passage and a cooling air passage extending from the cooling air inlet through the gap between the windings of the transformer to the first air passage are formed.

  According to this configuration, the cooling air intake port passes through the second ventilation path below the second partition plate, passes through the winding of the transformer, and further through the first ventilation path to the exhaust ceiling fan. And a cooling air passage extending from the cooling air inlet to the first air passage through a gap between the winding portions of the transformer. Thereby, the cooling air can be passed through and around the winding portion of the transformer, and the cooling efficiency of the transformer can be improved. In addition, since it is not necessary to restrict the cooling air passage to be unnecessarily narrow, it is possible to suppress a decrease in cooling efficiency even if there is a reduction in the air volume of the cooling fan.

Further, the transformer cooling device according to the second embodiment includes a third partition plate that partitions the periphery up and down on the upper side of the transformer and has at least an opening facing the winding portion of the transformer. I have.
According to this configuration, cooling air is introduced around the winding part of the transformer by the second partition plate on the lower side of the transformer, and the winding part of the transformer by the third partition plate on the upper side of the transformer. The cooling air can be sucked from the periphery of the transformer, and the cooling air can be efficiently guided around the transformer.

In the transformer cooling device according to the third aspect, the first partition plate is disposed with a gap between the upper surface of the transformer and the upper surface of the housing. An upper partition plate portion having a bent portion, and a side partition plate portion extending from both sides of the upper partition plate portion through the side surface of the transformer to the rear surface side and the lower surface side of the housing. Yes.
According to this configuration, by covering the periphery of the transformer with the upper partition plate portion and the side partition plate portion of the first partition plate that partitions the front and rear of the transformer, the casing is divided into the front and rear sides on the rear side of the transformer. A first ventilation path having a width corresponding to the width of the transformer can be formed. Thereby, the cooling air sucked from the cooling air intake port passes through the gap between the winding portions of the transformer, and the cooling efficiency of the transformer can be further improved.

Further, in the transformer cooling device according to the fourth aspect, the exhaust ceiling fan has a fan center axis line on the back side from the center position in the front-rear direction of the winding portion of the transformer, and a front edge of the opening portion. According to this configuration arranged so as to be in the vicinity of the front end edge of the transformer, the cooling air reaching the back side through the winding portion of the transformer can be reliably exhausted by the exhaust ceiling fan.
The transformer cooling device according to the fifth embodiment is characterized in that a plurality of exhaust ceiling fans are installed in parallel in the width direction.
According to this configuration, the cooling air passing through the transformer windings can be exhausted by a plurality of exhaust ceiling fans, and the cooling air efficiency can be improved by increasing the air volume of the cooling air.

  According to the present invention, the following effects can be obtained with a simple configuration in which only the second partition plate having an opening facing at least the winding portion of the transformer is provided. According to the configuration of the present invention, the cooling air intake port passes through the second ventilation path below the second partition plate, passes through the winding portion of the transformer, and further through the first ventilation path, the exhaust gas. A cooling air passage leading to the ceiling fan and a cooling air passage extending from the cooling air inlet through the gap between the windings of the transformer to the first air passage can be formed. As a result, the cooling air can be passed through the inside and the periphery of the winding portion of the transformer, and the cooling efficiency of the transformer can be improved. Moreover, since the cooling air passage is not restricted narrowly, the air volume of the cooling fan does not decrease, and the transformer can be efficiently cooled.

It is a front view showing one embodiment of the present invention. It is the front view which removed the front board of FIG. It is sectional drawing on the AA line of FIG. It is sectional drawing on the BB line of FIG. It is sectional drawing on the CC line of FIG. It is sectional drawing similar to FIG. 4 which shows the modification of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 5 are views showing a first embodiment of the present invention.
In the figure, reference numeral 1 denotes a housing (board). The housing 1 is formed in a rectangular parallelepiped shape with a front plate 1a, a rear plate 1b, an upper plate 1c, a bottom plate 1d, a left side plate 1e and a right side plate 1f. ing. A three-phase main circuit transformer 2 is housed in a substantially central portion of the housing 1 with three-phase winding portions Lu, Lv, and Lw arranged in parallel in the width direction.

  The main circuit transformer 2 is connected between a three-phase output of a power converter such as an inverter circuit having a semiconductor switching element and a load. The bottom surface of the base portion 2 a of the main circuit transformer 2 is fixed to the bottom plate 1 d of the housing 1. Here, as shown in FIG. 5, each of the winding portions Lu to Lw includes a central primary winding L1 and a secondary winding L2 disposed around the primary winding L1 at a predetermined interval. And.

The front plate 1a of the housing 1 has two rows of upper and lower doors 3U and 3L in the upper and lower stages, and is intermediate between the winding portions Lu, Lv and Lw of the main circuit transformer 2 of the lower door 3L. Cooling air inlets 4a and 4b are formed at positions facing the base 2a corresponding to the part. Each of these cooling air inlets 4 a and 4 b is covered with a mesh member 5.
In addition, a first partition plate 6 that partitions the front and rear of the housing 1 is disposed so as to surround the center of the main circuit transformer 2 in the front and rear direction inside the housing 1. The partition plate 6 is formed in a U-shape that surrounds the central portion in the front-rear direction of the main circuit transformer 2 when viewed from above with the upper partition plate portion 6a and the side partition plate portions 6b and 6c connected to the upper partition plate portion 6a. Yes.

  The upper partition plate 6a is opposed to the upper part of the main circuit transformer 2 at the middle position in the front-rear direction of the housing 1 with a predetermined gap g1 and extends to the left and right side plates 1e and 1f of the housing 1. A central plate portion 6d to be bent, a bent plate portion 6e to bend and extend forward above the central plate portion 6d, and a front plate that reaches the upper surface plate 1c of the housing 1 upward from the front end of the bent plate portion 6e. And 6f. The side partition plates 6b and 6c have inner surfaces extending downward from the left and right ends of the upper partition plate 6a with a predetermined gap with respect to the left and right ends of the main circuit transformer 2. It is formed to have a width that reaches the face plates 1e and 1f.

A first ventilation path 7 is formed by the upper partition plate portion 6 a of the first partition plate 6, the side partition plate portions 6 b and 6 c, and the back side of the main circuit transformer 2.
In addition, two exhaust ceiling fans 8 a and 8 b are disposed at positions facing the first ventilation path 7 of the upper surface plate 1 c of the housing 1. As shown in FIG. 4, each of the exhaust ceiling fans 8a and 8b has a fan center axis Lf slightly on the back side from the center position in the front-rear direction of the main circuit transformer 2, and the front edge is the main circuit transformer 2. It is arrange | positioned at the upper surface board 1c so that it may adjoin to the front-end edge.

  In addition, the cooling air intake ports 4a and 4b are divided in the vertical direction on the base 2a side of the main circuit transformer 2 in the housing 1 so that the lower side has a narrow area, for example, and the base 2a of the main circuit transformer 2 is also divided. The 2nd partition plate 10 which divides up and down is arrange | positioned. As shown in FIG. 3, the second partition plate 10 is transparent to the outer peripheral surface when the outer peripheral surface of the secondary winding L <b> 2 of each winding part Lu to Lw of the main circuit transformer 2 is projected. Openings 11 that face each other with a slight gap are formed. Therefore, the second ventilation path 12 is formed on the lower surface side of the second partition plate 10.

  A third partition plate 13 that partitions the upper part 2 b of the main circuit transformer 2 in the vertical direction is disposed on the upper part 2 b side of the main circuit transformer 2 in the housing 1. As shown in FIG. 3, the third partition plate 13 is also transparent to the outer peripheral surface when the outer peripheral surface of the secondary winding L <b> 2 of each winding part Lu to Lw of the main circuit transformer 2 is projected. An opening 14 is formed opposite to each other with a slight gap.

Next, the operation of the first embodiment will be described.
Exhaust ceiling fans 8 a and 8 b are arranged above the first ventilation path 7 on the back side of the main circuit transformer 2 surrounded by the partition plate 6. And this 1st ventilation path 7 is the clearance gap g1 between the upper partition plate part 6a of the 1st partition plate 6, and the upper end part of the main circuit transformer 2, and each coil | winding part Lu ~ of the main circuit transformer 2. FIG. A gap g2 in the middle part of Lw, a gap g3 between the second partition plate 10 and the base part 2a of the main circuit transformer 2, the primary winding L1 and secondary in each winding part Lu to Lw of the main circuit transformer 2 The cooling air intake ports 4a and 4b provided in the front plate 1a of the housing 1 through the space g4 between the windings L2 and the gap g5 between the third partition plate 13 and the upper part 2b of the main circuit transformer. It is connected.

For this reason, by rotating and driving the exhaust ceiling fans 8a and 8b, outside air is taken into the housing 1 as cooling air from the cooling air intake ports 4a and 4b.
As shown in FIG. 4, the cooling air taken into the housing 1 is divided up and down by the second partition plate 10, and the cooling air on the lower side is the second air below the second partition plate 10. It goes to the base 2a side on the lower side of the main circuit transformer 2 through the ventilation path 12. And it goes upwards mainly through the space g4 between the primary winding L1 and the secondary winding L2 of each winding part Lu-Lw of the main circuit transformer 2 toward upper direction from the opening part 11. As shown in FIG. Thereafter, the third partition plate 13 moves upward through a gap g5 between the opening 14 and the upper portion 2b. The cooling air that has escaped upward passes through the gap g 1 between the upper partition plate portion 6 a of the first partition plate 6 and the upper surface of the main circuit transformer 2 on the front side of the first partition plate 6. Reach ventilation path 7. Further, the cooling air that has escaped upward reaches the first ventilation path 7 directly on the rear side of the first partition plate 6 and is discharged to the outside by the exhaust ceiling fans 8a and 8b.

  On the other hand, the cooling air sucked from the upper surface side of the second partition plate 10 of the cooling air intake ports 4a and 4b is between the left and right side edges of the main circuit transformer 2 and the left and right side plates 1e and 1f of the housing 1. Is closed by the side partition plates 6 b and 6 c of the first partition plate 6. Therefore, it reaches the first ventilation path 7 on the back side of the first partition plate 6 through the front face of each winding part Lu to Lw of the main circuit transformer 2 and through the gap g2 between each winding part Lu to Lw. It is discharged to the outside by the exhaust ceiling fans 8a and 8b.

  For this reason, each winding part Lu, Lv, and Lw of the main circuit transformer 2 includes cooling air passing through the space between the primary winding L1 and the secondary winding L2 therein, and each winding part Lu, Lv, and Cooling is performed both inside and on the surface side by the cooling air passing through the front face side of Lw and passing through the gaps between the winding portions Lu, Lv, and Lw. Thereby, each coil part Lu-Lw which is a heat-emitting part of the main circuit transformer 2 can be forcedly cooled efficiently.

In addition, a plurality of cooling air passages are formed between the cooling air inlets 4a and 4b and the exhaust ceiling fans 8a and 8b, and the passage area of the cooling air can be increased. Therefore, the air flow of the exhaust ceiling fans 8a and 8b does not decrease, and the main circuit transformer 2 can be efficiently forcibly cooled.
Further, the above-described effects can be achieved simply by providing the first partition plate 6, the second partition plate 10, and the third partition plate 13 in the housing 1, and the overall configuration can be simplified. While it can suppress that the body 1 enlarges, it can also suppress that manufacturing cost increases.

Thereby, the main circuit transformer 2 can be set on the premise of forced air cooling, and can be downsized. Further, since the cooling air is sucked only from the cooling air intake ports 4 a and 4 b provided on the front side of the housing 1, it is not necessary to provide the intake port on the back side of the housing 1. Furthermore, since the cooling air is sucked only from the cooling air intake ports 4a and 4b provided on the front side of the casing 1, it is not necessary to provide an intake space on the rear side of the casing 1, so that the rear side of the casing 1 Can be placed in contact with a wall or the like.
Therefore, it is possible to reduce the size of the casing 1 housing the main circuit transformer 2 and the installation space.

  In addition, in the said 1st Embodiment, although the case where the 3rd partition plate 13 was provided was demonstrated, it is not limited to this. That is, as shown in FIG. 6, the third partition plate 13 can be omitted. That is, the cooling air introduced into the space between the primary windings L1 and L2 inside the main circuit transformer 2 by the second partition plate 10 is somewhat the first ventilation path on the back side of the main circuit transformer 2 Although it flows to 7, it does not decrease greatly. Further, the cooling air does not greatly affect the cooling from the inside of the main circuit converter 2, and each winding portion is caused by the cooling air flowing through the first ventilation path 7 on the back side of the main circuit transformer 2. The back side of Lu to Lw is cooled. Therefore, there is no great variation in the overall cooling efficiency.

Moreover, in the said embodiment, although the case where the two cooling air inlets 4a and 4b were formed in the front side of the housing | casing 1 was demonstrated, it is not limited to this, One or three or more horizontally long The cooling air inlet may be formed.
Moreover, in the said embodiment, although the case where the main circuit transformer was applied as a transformer was demonstrated, it is not limited to this, This invention is applied when accommodating arbitrary transformers in the housing | casing 1. can do.

  DESCRIPTION OF SYMBOLS 1 ... Housing, 1a ... Front plate, 1b ... Rear plate, 1c ... Top plate, 1d ... Bottom plate, 1e ... Left side plate, 1f ... Right side plate, 2 ... Main circuit transformer, 2a ... Base, 2b ... Upper part, DESCRIPTION OF SYMBOLS 3 ... Opening / closing door, 4a, 4b ... Cooling air inlet, 6 ... 1st partition plate, 6a ... Upper partition plate part, 6b-6e ... Side part partition plate part, 7 ... 1st ventilation path, 8a, 8b ... Exhaust ceiling fan, 10 ... Second partition plate, 11 ... Opening portion, 12 ... Second ventilation path, 13 ... Third partition plate, 14 ... Opening portion

Claims (5)

A housing containing a transformer;
A first partition plate that partitions the periphery of the transformer back and forth in the housing to form a first ventilation path on the back side of the transformer;
An exhaust ceiling fan disposed on an upper surface of the housing opposite to the first ventilation path;
A cooling air inlet formed at a position facing the base of the transformer at the front of the housing;
The cooling air intake port is divided into upper and lower parts, and the periphery thereof is divided up and down on the base side of the transformer, and includes at least a second partition plate having an opening facing the winding part of the transformer, Cooling air passage from the cooling air inlet through the second ventilation path below the second partition plate, through the winding of the transformer, and through the first ventilation path to the exhaust ceiling fan And a cooling air passage extending from the cooling air inlet through the gap between the windings of the transformer to the first air passage.   2. The transformer according to claim 1, further comprising a third partition plate that vertically partitions the upper portion of the transformer on the upper side and has an opening facing at least the winding portion of the transformer. Cooling device.   The first divider plate includes an upper divider plate portion having a bent portion disposed between the upper surface of the transformer and the upper surface of the housing with a gap from the upper surface of the transformer, and the upper divider plate 2. The transformer according to claim 1, further comprising a side partition plate portion that extends from both sides of the plate portion to a rear surface side and a lower surface side of the housing through a side surface of the transformer. Cooling system.   The exhaust ceiling fan is arranged such that the fan center axis is on the back side from the center position in the front-rear direction of the winding portion of the transformer, and the front edge of the opening is in the vicinity of the front edge of the transformer. The transformer cooling device according to any one of claims 1 to 3, wherein the cooling device is a transformer.   5. The transformer cooling device according to claim 4, wherein a plurality of the exhaust ceiling fans are installed in parallel in the width direction.

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